<div class="row">
  <div class="col-sm-6">
    <div class="form-group">
      <label for="inputFirstName">First Name</label>
      <input type="text" class="form-control" id="inputFirstName" placeholder="First Name">
    </div>
  </div>
  <div class="col-sm-6">
    <div class="form-group">
      <label for="inputLastName">Last Name</label>
      <input type="text" class="form-control" id="inputLastName" placeholder="Last Name">
    </div>
  </div>
</div>
<div class="row">
  <div class="col-sm-6">
    <div class="form-group">
      <label for="inputFirstName">Email</label>
      <input type="email" class="form-control" id="inputEmail" placeholder="Email">
    </div>
  </div>
  <div class="col-sm-6">
    <div class="form-group">
      <label for="inputWebsite">Website</label>
      <input type="text" class="form-control" id="inputWebsite" placeholder="Website">
    </div>
  </div>
</div>
<button type="submit" class="btn btn-primary">Submit</button>